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DES-7200 Configuration Guide Chapter 2 Configuring BGP IP VPN
2-46
Configure route exchanging between PE and CE
The configurations of this section is the same as "Configuring Route Exchanging Between PEs
and CEs" in the previous section of "Configuring basic BGP/MPLS VPN Functions".
Caution
In Scenario I (Fig 13): In the network of IP core second-level ISP, if PE and CE
use EBGP to exchange internal routes, and since the external routes are
exchanged using BGP and CE is the route reflector, a route map needs to be
configured for PE-CE to filter external routes and avoid leaking external routes
into the PE of First Carrier.
Configure First Carrier to enable CSC
Configure on the First Carrier PE to enable CSC. Depending on the protocol used for exchanging
routes between PE and CE, the following two cases may apply:
z PE and CE use LDP to distribute labels
z PE and CE use EBGP to distribute labels
PE and CE use LDP to distribute labels
If PE and CE use IGP to exchange routes, then execute the following commands on PE and CE
respectively to configure PE and CE to use LDP to distribute labels.
The configuration steps of PE are shown below:
Command Function
DES-7200(config)# mpls router
ldp vrf-name
VRF to enable LDP (PE).
DES-7200(config-mpls-router)#
ldp router-id interface
interface-name force
Configure the RouterID of LDP.
DES-7200(config-mpls-router)#
advertise-labels for bgp-routes
[acl acl-name]
Configure to distribute labels for BGP routes. By
default, LDP will not allocate labels for BGP routes.
DES-7200(config-mpls-router)#
exit
Exit LDP instance configuration mode.